package com.exercise.rpc.common.utils;/**
 * Created by kete on 2018-10-25.
 */

import com.dyuproject.protostuff.LinkedBuffer;
import com.dyuproject.protostuff.ProtostuffIOUtil;
import com.dyuproject.protostuff.Schema;
import com.dyuproject.protostuff.runtime.RuntimeSchema;
import org.objenesis.Objenesis;
import org.objenesis.ObjenesisStd;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * 作者：kete
 * 创建时间：2018-10-25 17:27
 * 功能描述：
 * 版本：
 */
public class SerializationUtil{

        private static Map<Class<?>, Schema<?>> cachedSchema = new ConcurrentHashMap<>();

        private static Objenesis objenesis = new ObjenesisStd(true);

        private SerializationUtil() {
        }

        @SuppressWarnings("unchecked")
        private static <T> Schema<T> getSchema(Class<T> cls) {
            Schema<T> schema = (Schema<T>) cachedSchema.get(cls);
            if (schema == null) {
                schema = RuntimeSchema.createFrom(cls);
                if (schema != null) {
                    cachedSchema.put(cls, schema);
                }
            }
            return schema;
        }

        @SuppressWarnings("unchecked")
        public static <T> byte[] serialize(T obj) {
            Class<T> cls = (Class<T>) obj.getClass();
            LinkedBuffer buffer = LinkedBuffer.allocate(LinkedBuffer.DEFAULT_BUFFER_SIZE);
            try {
                Schema<T> schema = getSchema(cls);
                return ProtostuffIOUtil.toByteArray(obj, schema, buffer);
            } catch (Exception e) {
                throw new IllegalStateException(e.getMessage(), e);
            } finally {
                buffer.clear();
            }
        }

        public static <T> T deserialize(byte[] data, Class<T> cls) {
            try {
                T message = (T) objenesis.newInstance(cls);
                Schema<T> schema = getSchema(cls);
                ProtostuffIOUtil.mergeFrom(data, message, schema);
                return message;
            } catch (Exception e) {
                throw new IllegalStateException(e.getMessage(), e);
            }
        }

}
